Add a script for simulating the math

simulation.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+for (( frame=0; frame<=166; frame++ ))
+do  
+   echo "frame: ${frame}"
+done

stipple.sh

@@ -44,6 +44,7 @@ IMAGES=""
 
 stipple () {
 	png="${1}"
+	frame="${2}"
 	filename=`basename "${png}"`
 	name=`echo "${filename}" | cut -d'.' -f1`
 	num=`echo "${name}" | awk -F'_' '{print $(NF)}'`
@@ -84,10 +85,25 @@ stipple () {
 	fi
 }
 
+if [[ "${SINGLE}" != "" ]]; then 
+	i=0;
+	echo "Rendering a single frame, #${SINGLE}"
+	#files in dir
+	for png in "${INPUT}/"*.png ; do
+		if [[ ${i} -eq ${SINGLE} ]]; then
+			stipple "${png}" ${i}
+			break
+		fi
+		i=$((i+1))
+	done
+
+	exit
+fi
+
 i=0;
 #files in dir
 for png in "${INPUT}/"*.png ; do
-	stipple "${png}"
+	stipple "${png}" ${i}
 	i=$((i+1))
 done